Updated openstack/openstack
Project: openstack/neutron  80851f38b511420403cc398ae0e0838f2e14a41b

Fixes port update failure when device ID is not updated

The updation was failing because the changed_device_id variable
was undeclared.This fix declares the variable with a default value
at the beginning of the method.

Change-Id: I06dfea1170a6b2a649f4e1efe4bf70b7cee0eacb
Closes-Bug: 1337787